它可以比较粗略地描述成是发生在固定周期（这个周期通常是一年一次）的包含某一个物种很多成员的集体旅行，并且只有在长途旅行后才有回报。

It can loosely be described as travel that takes place at regular intervals—often in an annual cycle—that may involve many members of a species, and is rewarded only after a long journey.

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它表现为集体旅行，拥有长期递延的回报。

It represents collective travel with long-deferred rewards.

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寒暑假和假期较长的节假日，学校组织留学生到中国其它地区集体旅行。

During the two vacations and longer holidays, the school will organize international students to travel to other parts of China.

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